Seaquel
SQL Server error code

SQL Server error 6536

SQL Server raises error 6536 at severity 16, which marks a problem with the query or data that you can correct.

A fatal error occurred in the .NET Framework common language runtime. SQL Server is shutting down. If the error recurs after the server is restarted, contact Customer Support Services.
Msg6536
Severity16
Group6000–6999

Source: Database Engine events and errors